Cutting machine



May 10, 1955 R. B. CARROLL CUTTING MACHINE 3 Sheets-Sheet l Filed Feb. 8, 1952 N15 ll Il FI G. I

FIG. 5

INVENTOR. RAYMOND B. CARROLL BYMWPL Attorneys May 10, 1955 R. B. CARROLL CUTTING MACHINE 5 Sheets-Sheet 2 Filed Feb. 8, 1952 FIG. 2

INVENTOR. RAYMOND B. CARROLL BY Attorneys I May l0, 1955 R. B. CARROLL CUTTING MACHINE 3 Sheets-Sheet 3 Filed Feb. 8, 1952 INVENTOR.

RAYMOND B. CARROLL Bynfjyemt Attorneys United States Patent M CUTTING MACHINE Raymond B. Carroll, Syracuse, N. Y., assignor to Stone Machinery Co., Inc., Manlius, N. Y., a corporation of New York Application February 8, 1952, Serial No. 270,788

3 Claims. (Cl. 5198) This invention relates to cutting machines of the type employing a rotating abrasive disk, or the equivalent, as a cutting tool. In these machines, the work pieceis positioned upon a support, or table, and the motor driven disk is moved manually toward andl from the table to eiect movement of the rotating disk through the work piece.

The invention has as an object a cutting machine of the type referred to embodying a structural arrangement by which the cutting tool can be conveniently adjusted about a vertical axis and the counterbalancing force applied to the tool can be conveniently adjusted, the counterbalancing mechanism being entirely enclosed within the structure of the machine.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed. Y.

In describing this invention, reference is had Ito the accompanying drawings in which like characters designate corresponding parts in all the views.-

In the drawings:

- Figure l is a front elevational view.of a cutting machine embodying my invention.

Figure 2 is an end elevational view looking to the right of Figure 1, and with parts broken away and parts in section.

Figure 3 is a top plan view with parts broken away and parts in section.

Figure 4 is a view taken on line 4 4, Figure 3.

Figure 5 is a view taken on line 5 5, Figure 3.

The machine consists of a base in the form of a casting having a top surface 11 of substantially rectangular form and which serves as a table for partially supporting the work piece. The base is formed with a pair of ribs 12 extending from a substantially cylindrical portion 13 to the forward corners of the base, and a pair of ribs 14 located at the rear portion of the base.

The ribs 12, 14, are formed on their lower edges with horizontally extending anges 15 having supporting pads 16 at their outer extremities with the pads positioned at the corners of the base, as shown in Figure 3.

The cylindrical portion 13, located at the center of the base, is formed with a circular aperture in which there is journalled a support 18, the upper surface 20 of which is arranged in the plane of the top surface 11 of the base. The cylindrical support 18 is formed in its periphery with a circumferentially extending groove 21. The base 10 is formed with a pair of bosses 22 arranged in spaced relation on the forward part of the cylindrical portion 13. The rear part 24` of the cylindrical portion 13 is of reduced height extending between points indicated at 25, 26, Figure 3, and is provided with bosses 27 arranged in diametrically opposed relation respectively to the bosses 22. The bosses 22, 27, are apertured to receive pins 28, the inner ends of which are attened, as at 29, and are positioned in the groove 21 and thus serve to rotatably support the support member 18, the pins 28 2,707,853 A `Patented May 10, 1955 ICC . being fixedly mounted in the base, as by set screws r30, see Figures 4 and 5.

an enlarged head portion 41 at one end and adjusting nuts 42` at the opposite end to provide for adjustment of the bearings 38, as will be apparent from Figure 3. The arm 36 is of channel formation, the side walls being apertured to receive the ends of the shaft 40 to which it is fixedly secured, as by pins 44. l

A housing 46 is secured to the forward end of the arm, as by screws 47, and contains a motor operatively connected to an arbor shaft 48 on which the abrasive or cutting disk 49 is mounted, the arm being offset to position the disk 49 centrally above the support member 18. The abrasive disk 49 is enclosed by a guard housing 50 detachably secured to the top surface 20 of the support, as by screws 51, and provided with a discharge 'spout 52. The support 18 is formed with a slot 53 to receive a portion of the disk 49 during the cutting operation.

` There is xedly secured to the shaft 41 an arm 54, as by screws 55. The arm 54 depends from the shaft 41 in the vertical portion of the bracket 33 and there is connected to the lower end of the arm an eye member 58 secured to one end of a tension spring 59, the opposite end of which is provided with a coupling 60 threaded to receive a rod 61, the spring 59 and the rod 61 extending through an aperture 62 formed in the cylindrical portion' of the support and diametrically across the support member 18 Iand forwardly through an elongated slot 63v formed in the cylindrical portion 13 of the base. The forward end of the rod 61 is journalled in a screw 64 extending through the slot 63 and threading into the support member 18 and being provided with an enlarged head portion 66 engaging a washer 67 overlying the outer face of the cylindrical portion 13 of the base. The screw 66 serves as means for clamping the support fixedly to the base. Rotation of the support 18, bracket 33, arm 36 and motor housing 46, relative to the base, may be elected to the extent permitted by the elongated slot 63, as will be apparent. The outer end portion 68 of the rod 61 is formed with a non-circular surface for the reception of a wrench, or other tool, to effect rotation of the rod, the portion 68 abutting against the outer end of the head p0rtion 66 of screw 64, and the opposite portion threading into the coupling 60 whereby, upon rotation of the rod, the tension on spring 59 can be varied. The spring 59 serves to counterbalance the arm 36 and normally maintain the arm, and the housing 46 carried thereby, in the upward position, as shown in the drawings. The housing is provided with a forwardly extending handle 70 by means of which the operator can conveniently move the arm downwardly to move the abrasive disk 49 through a work piece positioned on the table surfaces 11, 20.

The table surface 11 is formed on each side of the supporting member with elongated slots 71 extending forwardly and rearwardly of the base for the reception of screws 72 which serve to clamp guide members 73 to the top surface of the base. The guide members 73 serve as a means against which the work piece may be positioned during the cutting operation, the support 18 being free to rotate below the guide members. The guard housing 50 is formed with a rectangular opening 74 to permit the work piece to extend through the guard.

The table surface 11 of the base is provided with an arcuate arrangement of indicia, as at 75, Figure 3, to aid the operator in effecting rotative adjustment of the support and abrasive wheel to the proper position to effect cutting of the work piece at the desired angle.

The upwardly extending portion of the bracket 33 is formed with a forwardly extending boss 76 for engagement by a screw 77 threaded through the top wall of the arm 36 and which, upon engagement with the boss 76, serves as a stop for the downward movement of the arm 36.

The counterbalancing spring 59 and the structure for adjusting the tension thereon is contained within the rotatable support 18 and` is conveniently adjusted externally of the base. If desired, the counterbalancingstructure may be replaced with hydraulic cylinder and piston structure to provide power means for moving the arm 36 about the axis of the shaft 41,

What I claim is:

1. A cutting machine comprising a base formed with a circular aperture, a cylindrical support mounted in said aperture for rotation about a vertical axis, said support being formed on its periphery with a circumferentially extending grove, a plurality of pins mounted in the base and having end portions projecting into said groove for rotatably supporting the support, a bracket xedly mounted on the support and extending rearwardly and upwardly therefrom, an arm pivotally mounted on the upper end of said bracket and overhanging said support, and a power operated cutting tool mounted on said arm.

2. A cutting machine comprising a base formed with a cylindrical portion and having a work supporting surface extending radially from the upper edge of said cylindrical portion, a support member journalled in said cylindrical portion and having its top surface positioned co-planular with the worky supporting surface of the base and forming a continuation thereof, a bracket fixedly mounted on the support and extending rearwardly and upwardly therefrom, an arm pivotally mounted on. the upper end of the bracket and extending forwardly from said pivot over said work supporting surface, a power operated cutting tool carried by the forward end of said arm above said support, said cylindrical portion of the base being formed with a circumferentially extending slot, a clamp member carried by the support and extending through said slot, said clamp member being operable to clamp the support to the base.

3. A cutting machine comprising a base formed with a cylindrical portion and having a work supporting surface extending radially from the upper edge of said cylindrical portion,4 a cylindrical support member journalled in the cylindrical portion of the base and having a top surface extending co-planular with the work supporting surface of the base, a bracket fxedly secured to said support and extending radially and upwardly therefrom, an arm pivotally mounted at one end to the upper end of said bracket, a power operated cutting tool mounted at the opposite end of said arm and being positioned above said support, the cylindrical portion of the base member being formed with a'circumferentiallyextending slot, a clamp member carried by the support and extending through said slot andbeing cooperable to clamp the support to the base, a link depending from said arm in said bracket, a spring positioned in said support and being operatively connected to said link, a rod connected to said spring and extending through said clamp member and being operable upon rotation to adjust the tension of said spring, and said spring being effective to yieldingly move said arm upwardly.

References Cited in the file of this patent UNITED STATES PATENTS 1,481,569 Tannewitz Jan. 22, 1924 2,201,658 Whitney May 21, 1940 2,315,090 Dreher Mar. 30, 1943 2,347,223 Tautz Apr. 25, 1944 2,354,509 Dreher July 25, 1944 2,435,156 Pealer Jan. 27, 1948 2,459,233 Mall Jan. 18, 1949 2,464,117 Coates Mar. 8, 1949 2,565,510 Martin Aug. 28, 1951 

